Bea is lovely. They are a bit similar. But also OP you can’t give someone Herbie as a full name surely, it’s cute but he isn’t going to be a baby for ever...
How about Frankie, Charlie, Joe, Lawrie, Albie, Artie, Dickon, Robin, Teddy (but I would put Francis/Franklin, Charles, Joseph, Lawrence, Albert, Arthur, Richard, Robert, Edward on the birth cert) - or, Tobias, Barnaby/Barnabus, Max, Noah, Zackary, Jude